KR100761123B1 - Light Emitting Display Device and Method for Manufacturing the same - Google Patents

Abstract

The present invention relates to an electroluminescent display device and a manufacturing method thereof, and more particularly, to a passive matrix type electroluminescent display device.

An electroluminescent display device according to the present invention comprises: a pixel circuit portion including a light emitting layer embedded between two electrodes formed on a substrate; A protective film formed on one of the two electrodes; A plurality of wires connected to the two electrodes on the protective film; And a driver formed on the passivation layer and electrically connected to the plurality of wires to apply signals to the two electrodes.

EL, driver, scan wiring

Description

Light Emitting Display Device and Method for Manufacturing the same

1A is a cross-sectional view of a conventional organic light emitting display device.

1B is a plan view of a conventional organic light emitting display device.

2A illustrates an electroluminescent display device according to an exemplary embodiment of the present invention.

FIG. 2B is a sectional view of FIG. 2A taken along line A-A.

2C is a plan view of FIGS. 2A and 2B.

2D and 2E show a modified embodiment of FIGS. 2A and 2B on a plan view.

3A to 3G are steps illustrating a method of manufacturing an electroluminescent display device of the present invention.

<Explanation of symbols on main parts of the drawings>

210: substrate 212: anode

213: interlayer insulating film 215: light emitting layer

220: cathode 221: scan wiring

222: data wiring 223: protective film

224: wiring protection film 225: signal wiring

230: driving unit V: pixel circuit unit

The present invention relates to an electroluminescent display device and a manufacturing method thereof, and more particularly, to a passive matrix type electroluminescent display device.

In the organic light emitting display device, electrons and holes are injected into the light emitting layer from an electron injection electrode and a hole injection electrode, respectively, and an exciton in which the injected electrons and holes combine is excited. The device emits light when it falls from the ground state to the ground state.

The organic light emitting diode is classified into a passive matrix organic light emitting diode (PMOLED) and an active matrix organic light emitting diode (AMOLED) according to a driving method. .

In addition, the organic light emitting display device has a top emission method and a bottom emission method according to a direction in which light is emitted.

Such an organic light emitting display device is an organic light emitting display device that can display on a panel by including a device component necessary for driving such as a driving unit.

However, such organic light emitting display devices still have many problems to be solved, and related technology development continues.

Hereinafter, a problem of the conventional organic light emitting display device will be described with reference to FIGS. 1A and 1B.

1A is a cross-sectional view illustrating a conventional organic light emitting display device, and FIG. 1B is a plan view of a conventional organic light emitting display device.

The conventional organic light emitting display device 100 includes an anode 112 separated on a substrate 110 at a predetermined interval, an insulating layer 113, a partition 125, and an organic layer 115 on the anode 112. And a passive matrix organic electroluminescent device having a structure in which a cathode 120 is formed.

The anode 112 formed on the substrate 110 is formed of indium tin oxide (ITO) to have a transparent electrode, and the insulating layer 113 insulates the conductive portion between the anode 112 and the cathode 120. It is formed for the purpose of.

Here, the insulating layer 113 is patterned to have an open portion in a region where the anode 112 is formed so that a pixel can be formed, and the organic layer 115 is formed on the patterned open portion.

Meanwhile, for convenience of the process, when forming the organic material layer 115 or the cathode 120 by further forming the partition wall 125 having an inverted rhombus shape on the substrate 110, the organic material layer is formed by the partition wall 125 formed without shadow masking. The 115 and the cathode 120 may be separately formed on the substrate 110.

Here, in the organic layer 115, a lower common layer forming a hole injection layer and a hole transport layer for transporting the injected holes to the light emitting layer in order to facilitate the injection of holes on the anode 112. Is formed.

In addition, the organic layer 115 includes an electron injection layer and an upper common film forming an electron transport layer for transporting the injected electrons to the light emitting layer to facilitate the injection of electrons on the cathode 120. Is formed.

Meanwhile, the organic material layer 115 has a structure including a light emitting layer emitting light while recombination of holes and electrons supplied by the anode 112 and the cathode 120 is performed between the lower common film and the upper common film. Is formed.

FIG. 1B illustrates the case of the organic light emitting display device 100 in which scan lines 121a and 121b connected to the cathode 120 are formed in an odd number and an even number. The illustrated organic light emitting display device 100 uses the same reference numerals for convenience and understanding of the same components described above.

The conventional organic light emitting display device 100 illustrated in FIG. 1B is configured to apply a scan signal in order of left to right or right to left by connecting a wire to a cathode 120 covering an organic material layer formed in the pixel circuit unit V. FIG. It was. The driver 130 for applying a signal as described above is formed on one side of the substrate 110 and is also connected to the data wiring 122 for applying a data signal to the anode 112.

Accordingly, the organic light emitting display device 100 may emit the organic layer formed in the pixel circuit unit V by the scan signal and the data signal through the driver 130.

On the other hand, the cathode 120 connected to the odd wiring is defined as the odd scan wiring 121a, and the cathode 120 connected to the even wiring is defined as the even scan wiring 121b, which is commonly referred to as scan wiring 121a and 121b.

As described above, the cathode 120 formed on the pixel circuit unit V of the organic layer is connected to the left and right (or right and left) intersection scan wires 121a and 121b.

As a result, the positions where the odd scan wiring 121a and the even scan wiring 121b constituting the scan wiring 121a and 121b are changed, respectively, so that the resistance difference between the conductive wires flowing through the wiring is also different.

In addition, as the resistance difference is formed inside the pixel circuit unit V, and the number of inches of the cathode 120 increases, a problem arises in that a luminance business card crosses due to the resistance difference of the pixel circuit unit V. FIG.

This, in turn, causes a blinking in the form of a comb when a particular image is displayed on the panel.

This phenomenon is because the scan wirings 121a and 121b are wired in the order from left to right or from right to left, and on the other hand, the lengths of the wirings are changed accordingly, which causes a cause that the internal resistance of the wirings also varies. Because.

Here, since the conventional organic light emitting display device 100 has the scan wirings 121a and 121b formed on the left and right sides of the substrate 110, a dead space occupied by the wiring is formed on the substrate 110. There is a problem in that there is a limit in manufacturing the organic light emitting display device 100. Accordingly, as the size of the organic light emitting display device 100 increases, the space will be increased exponentially.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to form a scan wiring in a symmetrical shape on a pixel circuit portion of an electroluminescent display device and to form a driving portion behind an area in which light emits light so that data and scan signals are symmetrically formed. To be entered.

Accordingly, the electroluminescent display device can reduce the comb pattern that occurs when light and shade cross each other in the same column at the edge of the pixel circuit portion, and eliminate the dead space by forming the scan wiring behind the pixel circuit portion.

According to an aspect of the present invention, there is provided an electroluminescent display device comprising: a pixel circuit unit including an emission layer embedded between two electrodes formed on a substrate; A protective film formed on one of the two electrodes; A plurality of wires connected to the two electrodes on the protective film; And a driver formed on the passivation layer and electrically connected to the plurality of wires to apply signals to the two electrodes.

Here, in order to implement the present invention, one of the two electrodes may be an anode formed on the substrate and the other may be a cathode formed on the light emitting layer.

Here, in order to implement the present invention preferably, it may further include an interlayer insulating film which is located on the anode and has an open portion for exposing a part of the anode.

Here, in order to implement the present invention, the anode may be formed in a stripe shape on the substrate, the cathode may be formed in a stripe shape so as to cross the anode to be formed on the entire surface of the light emitting layer.

Here, in order to implement the present invention preferably, the light emitting layer is located in the open portion, it may include an organic material.

Here, in order to implement this invention preferably, the protective film may be formed in the whole surface of a board | substrate except both ends of a cathode and one part of an anode.

Here, in order to implement the present invention, a plurality of wirings are connected to the cathode to apply a scan signal, a data wiring connected to the anode to apply a data signal, and connected to the driver to apply a drive signal It may be a signal wiring.

Here, in order to implement the present invention preferably, the driving unit may be located in the center of the pixel circuit unit, and a plurality of wirings may be formed based on the driving unit.

Here, in order to implement the present invention, a wiring insulating film may be formed on the entire surface of the substrate except for the central portion of the pixel circuit portion to which the driver and the plurality of wirings are electrically connected.

Meanwhile, in the method of manufacturing an electroluminescent display device according to the present invention, (a) a pixel is formed by sequentially forming a first electrode formed in a stripe shape on a substrate, an interlayer insulating film formed with an open portion at the first electrode, and a light emitting layer sequentially formed at the open portion; Depositing a second electrode on the substrate except one predetermined portion of the first electrode on the substrate having the circuit unit; (b) separating the second electrode with a laser to cross the first electrode and cover the light emitting layer; (c) forming a protective film on the substrate except one predetermined portion of the first electrode and a predetermined portion of both ends of the second electrode; (d) forming a plurality of scan wirings, data wirings and signal wirings on the pixel circuit portion on which the protective film is formed; (e) forming a wiring protection film on the substrate, except for a part of the pixel circuit unit where scan wiring, data wiring and signal wiring are collected; (f) mounting the driving unit to be electrically connected to the plurality of scan wirings, data wirings, and signal wirings formed in a portion of the pixel circuit unit.

Here, in order to implement the present invention, the first electrode may be an anode, the second electrode may be a cathode.

Here, in order to implement the present invention preferably, the scan wiring is connected to the cathode, the data wiring is connected to the anode, the signal wiring may be connected to the driving unit.

Here, in order to implement the present invention preferably, the pixel circuit portion where scan wiring, data wiring and signal wiring are collected may be a central portion of the pixel circuit portion.

Here, in order to implement the present invention preferably, the light emitting layer may contain an organic material.

Specific details of other embodiments are included in the detailed description and drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 2A, 2B, and 2C.

<Example 1>

FIG. 2A is a view illustrating an electroluminescent display device according to the present invention, FIG. 2B is a cross-sectional view of FIG. 2A taken along AA, and FIG. 2C is a plan view of FIGS. 2A and 2B, and FIGS. FIG. 2E is a plan view of a modified embodiment of FIGS. 2A and 2B.

As shown in FIGS. 2A to 2C, the electroluminescent display 200 includes a pixel circuit unit V formed of an emission layer 215 embedded between two electrodes formed on the substrate 210. The protective film 223 is formed on one of the two electrodes, and a plurality of wires connected to the two electrodes are formed on the protective film 223. In addition, the driver 230 is formed on the passivation layer 223 and electrically connected to the plurality of wires to apply signals to the two electrodes.

Here, one of the two electrodes is the anode 212 formed on the substrate 210 and the other is the cathode 220 formed on the light emitting layer 215. The anode 212 is formed in a stripe shape on the substrate 210, and further includes an interlayer insulating layer 213 having an open portion exposing a portion of the anode 212. The organic light emitting layer is formed by the light emitting layer 215 formed of the organic material in the open part, but the inorganic light emitting layer may be formed by forming the inorganic light emitting layer on the light emitting layer 215.

Meanwhile, the cathode 220 formed here is formed on the entire surface of the light emitting layer 215, and is formed in a stripe shape so as to intersect the anode 212. Here, the cathode 220 may be separated into a stripe shape using a laser. Accordingly, the electroluminescent display device of the present invention does not constitute a partition wall.

The protective layer 223 described above is formed on the entire surface of the substrate 210 except for both ends of the cathode 220 and one portion of the anode 212. In this case, the passivation layer 223 may be formed to protect a device formed on the substrate 210. Accordingly, the element formed on the substrate 210 is protected by the protective film 223 to protect from external oxygen or moisture.

Here, the plurality of wires are connected to the cathode 220 to scan lines 221 for applying scan signals, to the anodes 212 for data lines 222 for applying data signals, and to the driving unit 230. Signal wiring 225 for supplying a signal is included. Here, the driver 230 is positioned at the center of the pixel circuit unit V, and a plurality of wires are formed based on the driver 230.

Here, the wiring protection layer 224 is formed on the entire surface of the substrate 210 except for the central portion of the pixel circuit unit V in which the driver 230 and the plurality of wirings are electrically connected. Here, the wiring protection film 224 is a protection layer for protecting a plurality of wirings formed on the entire surface of the substrate 210.

Meanwhile, according to the present invention described above, the electroluminescent display device 200 has a form of a chip on glass (COG) type in which the driver 230 is formed behind the pixel circuit unit V. FIG.

In addition, in the electroluminescent display device 200 according to the present invention, an inner lead bonding (ILB) or an outer lead bonding (OLB) is connected to a signal wiring 225 connected to the driver 230 and an external connection wiring 226 connecting an external device. Power supply to the driving unit 230 and a signal to each of the scan wires 221 and the data wires 222 to drive the electroluminescent display device 200.

Meanwhile, in the above-described embodiment, the driver 230 for supplying signals to each of the scan wires 221 and the data wires 222 is formed in the center, but as in the modified embodiment shown in FIGS. 2D and 2E. If the signal applied to the wiring 221 can be applied under the same conditions, the position thereof may be formed differently.

Accordingly, the present invention described above, since the signal applied to the scan wiring can be given to both ends in the same way, it is possible to transmit the signal more effectively than the scan wiring method connected to the cathode in the odd even number. Accordingly, when a specific image is displayed on the panel of the electroluminescent display, flickering in the form of a comb pattern can be prevented from occurring.

In addition, since a plurality of wirings such as scan wirings are formed behind the pixel circuit unit, it is possible to solve a problem in which a dead space is formed on the left and right sides of the pixel circuit unit by a plurality of wirings such as scan wirings as in the related art.

Further, even if the pixel circuit portion of the electroluminescent display device is enlarged, the space occupied by a plurality of wirings, such as scan wiring, is eliminated, thereby providing an electroluminescent display device capable of large area.

<Production method>

3A to 3G are diagrams illustrating a method of manufacturing the electroluminescent display device of the present invention step by step.

As shown in the drawing, a method of manufacturing an electroluminescent display device includes (a) a first electrode 312 formed in a stripe shape on a substrate, an interlayer insulating film formed with an open portion at the first electrode 312, and a light emitting layer formed at the open portion. The second electrode 320 is deposited on the substrate 310 except for one predetermined portion of the first electrode 312 on the substrate 310 having the pixel circuit unit V formed thereon. Here, the light emitting layer is formed of an organic material, but composed of an organic light emitting device, of course, may be formed of an inorganic light emitting device by forming an inorganic material.

On the other hand, according to the manufacturing method of the present invention, it is assumed that the pixel circuit portion (V) formed up to the light emitting layer is already provided on the substrate 310, and the description will be continued.

Referring to FIG. 3A, the second electrode 320, which is a cathode, is deposited on the substrate 310 except for a predetermined portion of the first electrode 312, which is an anode.

Subsequently, referring to FIG. 3B, a step of separating and forming the second electrode 320 with the laser L so as to cross the first electrode and cover the light emitting layer is performed. Accordingly, the second electrode 320 is separated and formed in a stripe shape by the laser L, respectively. However, the second electrode 320 may be formed by other methods as well as the laser (L).

Subsequently, referring to FIG. 3C, the substrate 310 is removed except for one predetermined portion D of the first electrode 312 and predetermined portions S1 and S2 at both ends of the second electrode 320. A protective film 323 is formed on the substrate. As a result, portions D, S1, and S2 of the first electrode 312, which is an anode, and the second electrode 320, which is a cathode, are opened from the passivation layer 323.

3D, a plurality of scan wirings 321, data wirings 322, and signal wirings 325 are formed on the pixel circuit unit V on which the passivation layer 323 is formed. Here, although the first electrode 312 and the second electrode 320 are not shown in the drawing, the first electrode 312 is connected to the data line 322 and the second electrode 320 is scanned. It is connected to the wiring 321. Meanwhile, the plurality of scan wirings 321, data wirings 322, and signal wirings 325 are formed in the central portion of the pixel circuit portion V. FIG.

Next, referring to FIG. 3E, except for a part of the pixel circuit unit V in which the scan wiring 321, the data wiring 322, and the signal wiring 325 are collected, the wiring protective film (eg, on the substrate 310) is formed. 324 is formed. That is, the wiring protection layer 324 is formed on the substrate 310 except for the scan portions 321, the data lines 322, and the pad portions p1, p2, and p3 to which the signal lines 325 and the driver 330 are connected. Formed.

3F, the driver 330 is mounted to be electrically connected to the plurality of scan wires 321, the data wires 322, and the signal wires 325 formed on a portion of the pixel circuit unit V. Referring to FIG. Do the steps.

Here, the driver 330 is electrically connected to the scan wiring 321, the data wiring 322, and the signal wiring 325 formed in the open pad portions p1, p2, and p3 and mounted on the wiring insulating layer 324. It is.

In the electroluminescent display device manufactured as described above, like the electroluminescent display device 300 shown in FIG. 3G, a pixel circuit portion V including an emission layer embedded between two electrodes formed on the substrate 310 is formed. It is. A protective film is formed on one electrode selected from two electrodes, and a plurality of wirings connected to two electrodes are formed on the protective film. On the wiring protection layer 324, a driver 330 electrically connected to a plurality of wires and applying signals to two electrodes and an external connection wiring 326 supplying a driving signal to the driver 330 are formed.

On the other hand, in the above-described manufacturing method, the driving unit 330 for supplying signals to the scan wiring 321 and the data wiring 322 is formed in the center, but the signal applied to the scan wiring 321 can be applied under the same conditions. If so, the position can be formed differently.

Accordingly, the present invention described above, since the signal applied to the scan wiring can be given to both ends in the same way, it is possible to transmit the signal more effectively than the scan wiring method connected to the cathode in the odd even number. Accordingly, when a specific image is displayed on the panel of the electroluminescent display, flickering in the form of a comb pattern can be prevented from occurring.

In addition, since a plurality of wirings such as scan wirings are formed behind the pixel circuit unit, it is possible to solve a problem in which a dead space is formed on the left and right sides of the pixel circuit unit by a plurality of wirings such as scan wirings as in the related art.

Further, even if the pixel circuit portion of the electroluminescent display device is enlarged, the space occupied by a plurality of wirings, such as scan wiring, is eliminated, thereby providing an electroluminescent display device capable of large area.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

According to the above-described configuration of the present invention, the scan wiring is formed on the pixel circuit portion of the electroluminescent display in a symmetrical form, and the driving portion is formed behind the area where light is emitted so that the data and the scan signal are symmetrically input. There is.

Accordingly, the electroluminescent display device can reduce the comb pattern that occurs when light and shade cross each other in the same column at the edge of the pixel circuit unit, and eliminate the dead space by forming the scan wiring behind the pixel circuit unit.

Claims (14)

A pixel circuit unit including an emission layer embedded between two electrodes formed on the substrate; A protective film formed on one of the two electrodes; A plurality of wires connected to the two electrodes on the passivation layer; And And a driver formed on the passivation layer and electrically connected to the plurality of wires to apply signals to the two electrodes. The method of claim 1, One of the two electrodes is an anode formed on the substrate and the other is a cathode formed on the light emitting layer. The method of claim 2, And an interlayer insulating layer on the anode and having an open portion exposing a portion of the anode. The method of claim 2, The anode is formed in a stripe shape on the substrate, And the cathode is formed on the entire surface of the light emitting layer to have a stripe shape to cross the anode. The method of claim 3, The light emitting layer is in the open portion, the electroluminescent display device including an organic material. The method of claim 1, And the passivation layer is formed on the entire surface of the substrate except for both ends of the cathode and one part of the anode. The method of claim 1, The plurality of wirings may include a scan wiring connected to the cathode to apply a scan signal, a data wiring connected to the anode to apply a data signal, and a signal wiring connected to the driving part to apply a driving signal. Display device. The method of claim 6, And the driving part is positioned at the center of the pixel circuit part, and the plurality of wirings are formed based on the driving part. The method of claim 7, wherein And an interconnection protection layer formed on an entire surface of the substrate, except for a central portion of the pixel circuit unit, to which the driving unit and the plurality of wirings are electrically connected. (a) a first electrode formed in a stripe shape on a substrate, an interlayer insulating film formed with an open portion on the first electrode, and a light emitting layer formed sequentially on the open portion to form a pixel circuit portion of the first electrode; Depositing a second electrode on the substrate except one predetermined portion; (b) separating the second electrode with a laser to cross the first electrode and cover the light emitting layer; (c) forming a protective film on the substrate except one predetermined portion of the first electrode and a predetermined portion of both ends of the second electrode; (d) forming a plurality of scan wirings, data wirings and signal wirings on the pixel circuit portion on which the passivation layer is formed; (e) forming a wiring protection film on the substrate, except for the part of the pixel circuit unit where the scan wiring, the data wiring and the signal wiring are collected; and (f) mounting a driver to be electrically connected to the plurality of scan wirings, data wirings, and signal wirings formed on a portion of the pixel circuit unit. The method of claim 10, And the first electrode is an anode, and the second electrode is a cathode. The method of claim 11, And the scan line is connected to the cathode, the data line is connected to the anode, and the signal line is connected to the driving unit. The method of claim 11, And the pixel circuit portion in which the scan wiring, the data wiring and the signal wiring are collected is a central portion of the pixel circuit portion. The method according to any one of claims 10 to 13, The light emitting layer includes an organic material.

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